14 letters · 22 points in Scrabble
originBorrowed from German Bremsstrahlung (“braking or deceleration radiation”), which had been coined in German by Arnold Sommerfeld from bremsen (“to brake”) + Strahlung (“radiation”) in 1909, and was first used in English by Arthur Edward Ruark and Harold Urey in 1930.
Etymology from Wiktionary, CC BY-SA 3.0